Options And Accessories - WIKA DELTA-trans DPGT40 Betriebsanleitung

6. Commissioning, operation / 7. Options and accessories
6.3 Setting up a voltage supply
The voltage supply is made via a power supply unit or a control unit which
provides the energy limitation.
The power supply for the pressure gauge must be made via an energy-limited
electrical circuit in accordance with section 9.3 of UL/EN/IEC 61010-1, or an LPS
to UL/EN/IEC 60950-1, or class 2 in accordance with UL1310/UL1585 (NEC or
CEC). The power supply must be suitable for operation above 2,000 m should the
pressure gauge be used at this altitude.

7. Options and accessories

7.1 4-way valve manifold
Isolation of the ⊕ and ⊖ process lines for removing or testing the measuring
■
instrument without interrupting the running process operation.
Protection of the instrument against
excessive overpressure loading, such as
in pressure tests and undefined operating
conditions (including intermittent shutdown).
Pressure compensation for zero point
■
checking with running processes, and
avoiding one-sided overpressure loading
during start-up and operation phases (with
opened pressure compensating valve).
Venting the measuring lines with liquid
■
media and flushing of the measuring lines,
in order to remove contamination.
Specifications for handling
Sequence of operations to start measurement
■
1. Open the pressure compensating valve (middle valve spindle)
2. Open the shut-off valve for the negative media chamber (⊖, right-hand valve)
and the positive media chamber (⊕, left-hand valve)
3. Close the pressure compensating valve
Sequence of operations to flush/vent the measuring lines
■
1. Start: Open the shut-off valve for the ⊕ and ⊖ media chamber, open the
pressure compensating valve and vent valve
2. Finish: Close the pressure compensating valve and vent valve
WIKA operating instructions differential pressure gauge, model DPGT40
Pressure
compensating valve
Shut-off valve
⊕ side
Shut-off valve
⊖ side
EN
Vent valve
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